Answer:
A.) pesticides harming plants
Explanation:
A.) is correct because the harmful effects pesticides have on plants does not directly affect the air. While pesticides can contribute to air pollution, they are not an effect of it.
B.) is incorrect because often times when pollution is bad, the sky is black and overcast. This prevents plants from accessing sunlight necessary for photosynthesis.
C.) is incorrect because this occurs when harmful chemicals are released into the atmosphere (air). Once this accumulates, it can mix with rain and fall back to the Earth in the form of acid rain.
D.) is incorrect because this is oftentimes the most obvious and direct effect of polluted air. Again, smog and poisonous air result from poor air quality.
